Cheapest priced copy (Weatherlight): $0.79 at Card Kingdom, near mint, their price list as of .
Urborg Stalker 
Creature — Horror · 2/4 · Rare · Weatherlight · #85
At the beginning of each player's upkeep, if that player controls a nonblack, nonland permanent, this creature deals 1 damage to that player.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Weatherlight | 85 | Rare | $0.79 | — |
2 rulings from Wizards of the Coast
- 1 April 2008Urborg Stalker’s ability will trigger at the beginning of your upkeep as well.
- 1 April 2008This ability checks whether the player controls any nonblack, nonland permanents twice: once when it would trigger, and once when it resolves. If all the player’s nonland permanents are black at the time the ability would trigger, it doesn’t trigger at all. If all the player’s nonland permanents are black at the time the ability would resolve, it’s countered.